極低炭素オーステナイトステンレス鋼, Ni 基高合金の真空誘導溶解時の C-O 関係について

概要

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The C-O carbon vs. oxygen relations of extremely low carbon austenitic stainless steel and Ni-base alloy, in comparison with iron, were studied for the vacuum refined melts together with some thermodynamic considerations. Sampling was made during the quiescent period of melts in a 200 kg vacuum induction furnace with the MgO lining, and then the chemical compositions were determined. During quiescent period after violent boiling the C__--O__- relations in the stainless steels with C%=0.01 were shown to be in equilibrium and the following relations were obtained. C__-+O__-=CO, K=P_<CO>/a_O・a_C Melt Temp. (℃) a_0=F(a_C) P_<CO>(Atm.) Fe 1600 a_0=6.59×10_<-5>a_C^<-1.05> 3-4×10^<-2> Austenitic Stainless steel {1550 a_0=4.89×10^<-6> a_C^<-1.01> 2-3×10^<-3> 1650 a_0=1.44×10^<-5> a_C^<-0.92> 3-4×10^<-3>} Ni base high alloy 1550 5-15×10^<-3> Calculated values of P_<CO> for the iron melts were about 10 times higher than those for stainless steels. It is considered that the effect of refractory on the oxygen potential of molten steel depends on accompanying elements. For the Ni base high alloys it was found that the C__--O__- relation was similat to those for steel and the efficiency of deoxidizer added at tapping was greater than those for steels.
社団法人日本鉄鋼協会の論文
1977-01-01